激光热应力切割玻璃实验与分析

Experimental Analysis of Glass Cutting by Laser Thermal Stress

CO2激光器平均输出功率为100W时,通过聚焦光路在玻璃表面形成圆型的聚焦点。玻璃强烈地吸收10.6μm的激光,激光能量被玻璃表面15μm厚的吸收层吸收,形成局部的应力纹样分布(设定的切割线)。介绍了淬火气嘴将冷空气吹到玻璃表面对受热区域进行快速淬火;100W的激光能量照射玻璃表面,产生高于玻璃软化的温度;吹气冷却形成应力集中的热应力层,使玻璃从切开的断口沿切割线断开,断口光洁。实验证明,激光热应力切割玻璃的最佳速度是400mm/s。

When the output power of the CO2 laser machine reaches 100 W on average, the round focusing point can be formed on the surface of glass by the focusing light path. The laser energy of 10.6 μm wavelength is absorbed fiercely by the 15 μm-thick glass layer on the surface, and the locol stress line distributing is formed. At the same time the quenching mouth is blowing the colder air onto the glass surface, quenching the thermal area quickly. The temperature of the glass surface is higher than the softening point, blowing colder air onto the surface forms the thermal stress concentrtion layer. The glass is disconnected along the cut which is made by mechanic means before cutting, and the crack is smooth. The best pace of the laser thermal stress cutting is 400 mm/s which is testified by the experiment.